266 INDEX TO AMERICAN BOTANICAL LITERATURE 
Smith, G. M. A monograph of the algal genus Scenedesmus based 
upon pure culture studies. Trans. Wisconsin Acad. Sci. 18: 422- 
530. pl. 25-33. 1916. 
Scenedesmus Bernardii sp. nov. is described. 
Smith, G. M. A preliminary list of algae found in Wisconsin lakes. 
Trans. Wisconsin Acad. Sci. 18: 531-565. 1916. : 
Spaulding, P. Notes on Cronartium comptoniae—III. Phytopathol- 
ogy 7: 49-51. 7 F 1917. 
Spaulding, P., Detwiler, S. B., Pettis, C. R., & Metcalf, H. The white 
pine blister disease. Am. Forest. 23: 67-74. F 1917.  [lllust.] 
Speare, A. T. Sorosporella uvella and its occurrence in cutworms in 
America. Jour. Agr. Research 8: 189-194. pl. 66 +f.1. 5F 1917. 
Preliminary paper. 
Squires, W. A. The Monterey cypress. Am. Bot. 23: 8-10. F 1917. 
Cupressus macrocarpa, : 
Stallard, H. The origin of Sphagnum atolls. New Phytol. 15: 250- 
256. D 1916. 
Williams, B. Some factors influencing nitrogen fixation and nitrifica- 
tion. Bot. Gaz. 62: 311-317. 17 O 1916. 
Wilson, G. W. Notes on some pileate Hydnaceae from Iowa. Proc. 
Iowa Acad. Sci. 23: 415-422. 1916. 
Wilson, G. W. Scleroderma vulgare and its Iowa allies. Proc. Iowa 
Acad. Sci. 23: 411-414. 1916. 
Wilson, P. Adoxa Moschatellina. Addisonia 1: 41, 42. pl. 21. 30S 
1916. 
Wilson, P. Collecting pollen for hay fever investigations. Jour. yeh © 
Bot. Gard. 17: 157-159. 14 O 1916. 
Wilson, P. Tillandsia sublaxa. Addisonia 1: 77, 78. pl. 39. 30 D 1916. 
Wilson, W. J. Palaeobotany. Sum. Rep. Geol. Surv. Dept. Mines 
Ottawa 1914: [1503]: 130-134. 1915; 1915 [1616]: 205-209. 1916. 
Wolden, B.O. A six-leaved Deniaria. Am. Bot. 23: 18,19. F 1917. 
Wolf, F. A. A squash disease caused by Choanephora cucurbitarum. 
Jour. Agr. Research 8: 319-328. pl. 85-87. 26 F 1917. 
Wylie, R. B. The pollination of Vallisneria spiralis. Bot. Gaz. 63: 
135-145. pl. 9 +f. I-6. 17 F 1917 
Zeller, S. M. Studies in the physiology of the fungi—II. Lenzites 
saepiarta Fries, with special reference to enzyme activity. Ann. 
Missouri Bot. Gard. 3: 439-512. pl. 8,9. 12 Ja 1916. 
Zimmerman, H. E. Natives gathering Agave juice for pulque. Am. 
Bot. 23: 11,12. F 1917. [lIllust.] 
